Darin G. Billerbeck is President at LATTICE SEMICONDUCTOR CORP (LSCC). They have made 24 open-market trades across 2 companies since 2014, most recently 2026-05-21.
CIK 0001388177
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
2 open-market purchases totalling $49K since 2015, against 22 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| LSCC | 743,393 | $77.1M |
| MRAM | 127,925 | $1.7M |
| ZILG | 76,280 | — |
| Total | $78.7M |
Shares reported on the most recent Form 4, priced at the 2026-05-22 close. 1 holding could not be priced and is excluded from the total.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MRAM | SELL | 2026-05-11 | 2026-05-13 | $37.16 | $1.1M | -20.8% | -40.8% | -60.1% |
| MRAM | SELL | 2025-11-10 | 2025-11-12 | $9.42 | $113K | -11.9% | +4.1% | +29.8% |
| MRAM | SELL | 2023-12-08 | 2023-12-11 | $8.73 | $87K | +4.2% | -2.4% | -6.3% |
| MRAM | SELL | 2023-08-15 | 2023-09-20 | $9.63 | $193K | +9.5% | +8.7% | -5.7% |
| MRAM | SELL | 2023-03-08 | 2023-03-09 | $6.67 | $67K | -2.6% | -0.8% | +29.0% |
| MRAM | SELL | 2023-01-03 | 2023-01-04 | $5.51 | $7K | +14.4% | +27.5% | +17.8% |
| MRAM | SELL | 2022-12-02 | 2022-12-02 | $6.31 | $23K | -8.1% | -12.8% | +12.2% |
| MRAM | SELL | 2022-11-02 | 2022-11-03 | $6.16 | $22K | +8.4% | +1.0% | +19.1% |
| MRAM | SELL | 2022-10-01 | 2022-10-04 | $6.18 | $21K | -17.8% | -4.9% | -12.4% |
| MRAM | SELL | 2022-09-01 | 2022-09-06 | $6.89 | $24K | -0.9% | -5.9% | -6.7% |
| MRAM | SELL | 2022-08-02 | 2022-08-09 | $5.91 | $21K | +20.2% | +10.5% | +6.9% |
| MRAM | SELL | 2022-07-05 | 2022-07-06 | $4.93 | $18K | +1.8% | +33.3% | +26.5% |
| MRAM | SELL | 2022-06-01 | 2022-06-03 | $6.13 | $22K | -13.4% | -18.1% | +9.3% |
| MRAM | SELL | 2021-12-17 | 2021-12-20 | $10.45 | $407K | +9.7% | -14.0% | -12.4% |
| MRAM | SELL | 2021-12-02 | 2021-12-03 | $11.43 | $18K | +1.6% | +15.2% | -20.6% |
| MRAM | SELL | 2021-11-19 | 2021-11-23 | $12.16 | $942K | -13.3% | -8.6% | -17.8% |
| MRAM | SELL | 2021-09-02 | 2021-09-03 | $6.91 | $11K | -7.9% | -16.4% | +55.6% |
| MRAM | SELL | 2021-06-02 | 2021-06-04 | $6.21 | $9K | +8.4% | +0.2% | +22.8% |
| MRAM | SELL | 2021-05-20 | 2021-05-24 | $5.23 | $18K | +5.0% | +10.2% | +0.7% |
| MRAM | SELL | 2021-03-01 | 2021-03-03 | $6.01 | $16K | +18.3% | +0.7% | +10.7% |
| LSCC | BUY | 2015-08-17 | 2015-08-18 | $4.00 | $24K | -26.4% | -1.9% | -1.9% |
| LSCC | BUY | 2015-08-13 | 2015-08-14 | $4.07 | $25K | -26.4% | -1.9% | -1.9% |
| LSCC | SELL | 2014-05-14 | 2014-05-15 | $8.32 | $832K | -26.4% | -1.9% | -1.9% |
| LSCC | SELL | 2014-05-02 | 2014-05-06 | $8.20 | $618K | -26.4% | -1.9% | -1.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.